I am hoping to put together the weapon platform in the included pic. Going to be pricey but I just gotta have it. Bushy will be rifle of choice and the A.R.M.S S.I.R will be the platform. Can some one identify the front sight??? Have not seen it anywhere looks very much like the front sight from a SAW. How would I get that mounted as is in the pic? Would a special barrel be needed? All assistance will be greatly appreciated!

Fourth,
I have not heard that the PRI front sight needs a special barrel to mount, believe any M4 contour barrel will be fine. E-mail Wes Grant from MSTN and ask him, he's got a s**tload of info about the PRI/ARMS/Knight's stuff, just to be sure. He's a good guy, and will steer you in the right direction if asked.
The SIR system pictured is the "M" model, just in case you didn't know. It requires the removal of the delta ring to mount. The "C" model does not.
Have fun,
John